A heartline roll is a roller coaster inversion in which the rider performs a 360 degree roll on one axis. Unlike an in-line twist, the elevation of the track changes throughout the inversion to keep the train travelling at the same level.
The heartline roll was introduced by TOGO on their Ultratwister model, the first of which opened in 1984. In 1996, Intamin opened their first two roller coasters with heartline rolls. It has since been used by several companies including Zamperla, Gerstlauer, and Bolliger & Mabillard.
While usually existing on their own, multiple heartline rolls can be strung together. Double heartline rolls feature on Typhoon, a Gerstlauer Euro-Fighter installation, and Outlaw Run, a Rocky Mountain Construction wooden roller coaster. Intamin have included triple and quadruple heartline rolls on their 8-Looping and 10-Looping coasters respectively.
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- on the Roller Coaster DataBase.